ESTRATIGRAFÍA Y AMBIENTES DE SEDIMENTACIÓN DE LA FORMACIÓN SANTA CRUZ (MIOCENO TEMPRANO–MEDIO) EN EL RÍO SANTA CRUZ, PATAGONIA AUSTRAL, ARGENTINA
DOI:
https://doi.org/10.5710/PEAPA.27.07.2019.294Palabras clave:
Burdigaliense, Sedimentología, Sistema fluvial, Paleosuelo, Cuenca AustralResumen
La Formación Santa Cruz consiste en una sucesión de sedimentos continentales del Mioceno Temprano–Medio que se encuentran ampliamente distribuidos en la Patagonia austral. Se describen los atributos sedimentológicos y estratigráficos de tres localidades a lo largo del Río Santa Cruz. De este a oeste estas localidades son: Barrancas Blancas, Segundas Barrancas Blancas y Yaten Huageno. El análisis de facies permitió definir tres Asociaciones que representan acumulación en 1) planicies de inundación; 2) lóbulos de desbordamiento y crecidas en manto; y 3) canales fluviales. Las tres localidades son cronológicamente equivalentes y representan acumulación en un sistema fluvial de bajo gradiente con alta agradación, el cual drenaba hacia el este y noreste desde los Andes Patagónicos hasta la plataforma. Los rasgos de los paleosuelos, más algunas trazas fósiles reconocidas, sugieren un clima templado subhúmedo y en parte, una planicie herbácea.
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